Merge pull request #181 from asam-ev/133-complete-chapter-human-struc…

…ture-734

133 complete chapter human structure 734

content/geometry/object-human/human-general.adoc

@@ -1,3 +1,14 @@
 = General
 
-//Add general information about the human structure
+A human is a bipedal being that can be represented by an object in 3D geometry.
+
+The human 3D geometry is generically structured into the node structure and skeleton (also often called armature) defined in the xref:../geometry/object-human/human-index.adoc#_model_structure[Model structure].
+The structure starts with a Root node as a parent group for all other nodes in the structure.
+Splitting the object into different parts, such as clothing, hair, and accessories, enables animation and exchange of parts.
+Not all nodes have to be present in every human 3D model.
+Custom object parts may be added to facilitate and better visualize additional use cases, but all custom parts shall adhere to the specified structure principle.
+
+In the coordinate system for human 3D geometry, the x-axis points forwards, the y-axis points sidewards, and the z-axis points upwards.
+The default pose is the A-pose.
+The naming convention makes it possible to mirror one side of the skeleton to the other.
+The bones follow a specific bone orientation: The y-axis of a bone always follows the bone direction, regardless of whether it points sidewards, upwards, or forwards. The x-axis usually faces forwards accordingly.

content/geometry/object-human/human-index.adoc

@@ -1,6 +1,5 @@
 = Human structure
 
 include::human-general.adoc[leveloffset=+1]
-include::human-model-creation.adoc[leveloffset=+1]
-include::human-model-structure.adoc[leveloffset=+1]
+include::human-structure.adoc[leveloffset=+1]
 include::human-notes.adoc[leveloffset=+1]